What was the bloodiest single day in military history?
What was the bloodiest single day in military history? The Battle of Antietam was the bloodiest single-day encounter in American history with over 23,000 casualties.
What war killed the most US soldiers?
The American Civil War is the conflict with the largest number of American military fatalities in history. In fact, the Civil War's death toll is comparable to all other major wars combined, the deadliest of which were the World Wars, which have a combined death toll of more than 520,000 American fatalities.